avoid allocation for ASCII only

Author: ariksher-nex

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/java/JavaGenerator.java

@@ -3291,8 +3291,14 @@ private void appendDecoderDisplay(
  }
  else
  {
- //append(sb, indent, "builder.append('\\'' + " + varDataName + "() + '\\'');");
- append(sb, indent, formatGetterName(varDataToken.name()) + "(builder);");
+ if (characterEncoding.contains("ASCII"))
+ {
+ append(sb, indent, "builder.append('\\'');");
+ append(sb, indent, formatGetterName(varDataToken.name()) + "(builder);");
+ append(sb, indent, "builder.append('\\'');");
+ } else {
+ append(sb, indent, "builder.append('\\'').append(" + varDataName + "()).append('\\'');");
+ }
  }
 
  lengthBeforeLastGeneratedSeparator = sb.length();